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Method for a multitasking DMA controller

Publishing Venue

Abstract

Disclosed is a method for a multitasking direct memory access (DMA) controller. Benefits include improved performance and improved power performance.

Country

United States

Language

English (United States)

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Method for a multitasking DMA controller

Disclosed is a method for a multitasking direct memory access
(DMA) controller. Benefits include improved performance and improved power
performance.

Background

� � � � � DMA channels consume
power and use register space.

� � � � � In some conventional
application spaces, such as embedded and communications chipsets, a very large
number of DMA channels and application/driver control of the channel (rather
than the operating system) are advantageous.

� � � � � For a single threaded
DMA linked list, command blocks are fetched and executed in a sequential
fashion (see Figure 1). The DMA channel is idle during command fetch and while
a command block is awaiting execution.

� � � � � By supporting
multiple linked lists, the operating system (OS) can allocate virtual channels
to an application/driver while maintaining control over the arbitration time
between virtual channels. This technique enables each driver to control/manage
its own DMA channel, which appears to the application as a dedicated DMA
resource. This technique can also be leveraged within virtual machine
environments.